together for your future. ♪ >>> former president bill clinton's familiarity with painkillers goes back to when he lived in the white house. have you ever been prescribed a medication like this? >> well, i did take some painkillers when i tore my -- 90% of my quadracep, but i tried to be very careful and i was in a lot of pain. >> and years after leaving the oval office, he would once again need pain pills. he says he and his doctors were cautious. >> after my heart surgery, you know, i hurt pretty bad for three weeks so i got some medicine, but i really tried to get off of it as quick as i could. and my doctors were really good about it, you know, telling me, take this if it's killing you, but be careful. >> poison center, this is rosie. >> be careful. it's a warning that might prevent call after call pouring in here at the washington poison center. >> poison center, this is deborah. >> i wasn't getting pain relief and i took too many oxycodone. i took five 10-milligram oxycodone and i'm feeling really shaky, lightheaded. i'm just nervous. >> for the most part this hasn't been recogniz